M&S says

Introducing our Performance trouser – the ultimate trouser that works as hard as you do. The merino-wool rich blend has natural stretch for crease recovery. Our added Stormwear™ technology means you stay looking sharp, whatever the weather, while the Active waistband™ trousers move with you for added comfort on the go.

Care and Composition

35 days to return

You may return or exchange unused products within 35 days of purchase with a valid parcel summary document. Your items don't need to be in the original box or bag as long as they're securely packaged.

Hassle-free local returns

Post to a local address within Australia and choose one of the below options:
1. Australia post tracked return – pay only for local postage to a local address.
2. Same Day Courier Pick up – Arrange for a convenient courier pick-up at a desired location. Charges start from $5.95 depending upon your city. Learn more